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Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center. This puts a focus on some of the most important and very best NEO observation work, representative of the much larger NEO discovery and tracking effort. Object temporal distances are derived by A/CC from JPL Horizons data. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Impact Risk Monitoring on 25 November '18

Summary Risk Table for Risk Assessments Updated Today (last checks: NEODyS at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL and NEODyS listings is 100 years, and both post impact solutions beyond that for some special objects.
For the latest official risk assessments, and for explanations of the terminology, see the NASA/JPL Sentry and NEODyS CLOMON2 risk pages.

0000NNN000

Object

RiskMonitor

WhenNotedUTC

0000T0000YearRange

VI#

000NN00ProbCum

T0000PSCum

T0000PSMax

TS

Notes for Today's Latest Risk Assessments

2018 WJ

NEODyS

2200

2045-2096

7

9.58e-07

-6.91

-7.3

0

NEODyS: "Based on 67 optical observations (of which 0 are rejected as outliers) from 2018-11-17.268 to 2018-11-19.910."

JPL Sentry

2000

2045-2055

3

1.2058e-06

-6.75

-7.10

0

JPL: Computed at 07:11 today Pacific time based on 67 observations spanning 2.6420 days (2018-Nov-17.26735 to 2018-Nov-19.909366). Diameter approximately 0.010 km. from weighted mean H=27.56.

2018 VT5

NEODyS

2200

2078-2118

87

4.36e-05

-6.34

-6.83

-

NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2018-11-08.275 to 2018-11-14.642."

JPL Sentry

2000

2085-2117

39

3.5737455e-05

-6.40

-6.71

0

JPL: Computed at 07:10 today Pacific time based on 20 observations spanning 6.3673 days (2018-Nov-08.27373 to 2018-Nov-14.641033). Diameter approximately 0.007 km. from weighted mean H=28.44.

2018 TB

NEODyS

2200

2103

1

1.68e-06

-6.02

-6.02

0

NEODyS: "Based on 197 optical observations (of which 1 are rejected as outliers) from 2018-10-02.423 to 2018-11-19.459."

JPL Sentry

2000

2103-2103

1

1.229e-06

-6.14

-6.14

0

JPL: Computed at 07:07 today Pacific time based on 191 observations spanning 48.036 days (2018-Oct-02.42196 to 2018-Nov-19.45773). Diameter approximately 0.037 km. from weighted mean H=24.82.

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.